* {
  margin: 0;
  padding: 0;
  border: none;
  outline: none;
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}
body {
  overflow-x: hidden;
  background: #e3e3e3;
  text-align: left;
  font-family: "Times New Roman",Georgia,Serif;
  padding: 40px;
  font-size: 70px;
  line-height: 100px;
}
h3, h4 {
  color: blue;
  border: 1Px solid #e3e3;
  margin-top: 130px;
}
ul, ol {
  list-style-type: square;
}
#list {
  width: 300px;
  height: 1000px;
  overflow: hidden;
  position: fixed;
  top: 40px;
  left: 40px;
}
#app {
  float: right;
  width: 1000px;
  overflow: hidden;
  border-left: 1Px solid #963838;
  padding: 20px;
}
#app li {
  text-indent: 2em;
}
span {
  color: red;
  font-weight: 600;
}